Machine for cutting and shearing float or bridge threads



Jan. 31, 1933. 1,885,843

MACHINE FOR CUTTING AND SHEAR iNG FLOAT ()R BRIDGE THREADS I Filed Sept. 11, 1931' Jmntw FRED 5.15am,

Patented Jan. 31, 1933 UNITED STATES FRED s. BOYD, or mourns, sou'rn canonnvii, AssIeNoaor" onn-rnmnf'ro .111

WARD, OF LAURENS, SOUTH CAROLINA,

VILLE, SOUTH CAROLINA Application filed September 11, 1931.. Seriallto; 562,403.

This invention relates to machines for cutting and shearing float or bridge threads i Fig. 1.

passes over a guide bar 10, making a substanon cotton, silk, rayon, jacquard patterns and other goods which are woven with either filling, warp, or lappet spots.

Machines of this general character are well known in the art, some of which employ brushes for brushing up the fibre or threads so that the knives can get hold of them. However, the machines at present in use miss so many of the threads that it is necessary to run the cloth through the machine as many as six times in order to cut off all' of the loose ends.

Under the present invention it is proposed to employ a suction hood so located with respect to the cloth and with respect to the cutting off mechanism as to cause the threads to stand up from the cloth and be carried over a right angle guide while in this standing position in such way that the knives can get hold of the threads in a more effective manner. By virtue of this arrangement, I am able to effect marked economies in the finishing of these cloths and reduce the number of times that it is necessary to pass the cloth through the machine anywhere from v thirty to fifty percent.

In the accompanying drawing Figure 1 is a diagrammatic transverse sectional view through those portions of a cutting and shearing machine to which the invention has application.

Fig. 2 is a horizontal sectional view on line 2-2 of Fig. 1, and

Fig. 3 is an enlarged view of a portion of Like numerals designate corresponding parts in all the figures of the drawing. One machine of the character described which is in common use comprises a rotative cylinder 5 having spirally disposed blades 6 upon its periphery which co-act with the curved face 7 of a knife: bar 8. The cloth to be trimmed is indicated at 9 and said cloth tially right angle turn over said bar and passing downwardly between said guide bar and the knife bar. However, since many of the loose threads, indicated at 91 and which AND one- TH RD ro'crdnnsn;QF-GREEN- are a be trimmed or, would beiyiin igfia upon the cloth, inthe absenceof some means for elevatinglthem, many offthesepthreads pass downwardly with theoloth: without I being engaged by the knife edge.

The machine disclosed, as being in common use, includes a suction duct 11, a curved portion of which is carried around a rotary cylinder and terminates in an open suction mouth 13. This suction duct in which subnormal air pressure may be maintained by.

any suitable vacuum creating apparatus, such as a fan or otherwise, not shown, serves to collect and carry away the cut ofi threads which cling to the blades until they come into alignment with the mouth or orifice 13.

My invention comprises a suction hood 14: 1n which a partial vacuum may be created by any suitable air moving means or the top pacity of the duct 11 may be increased, as

indicated at 11a, at the point where the hood 14 is connected with the duct 11. I

It will be observed that the lower end of the hood 14 is spaced above the cloth, and that saidhood is also spaced such a distance away from the cylinder 5 that the suction will substantially cease to exert its effect" upon the threads just as they pass over the I in tending to resume their former fiat position "will actually move over the cutting edge of the knife bar 8. This will'bring such threads in position to be engaged and sheared off by the blades 6 of the cylinder 5. It has been found in actual practice that the threads retain their substantially upright'position long enough to be caught by the knife edge and sheared ofi by the blade 6. The'result is to effect a much cleaner and more eifective removal of the threads than is possible by any of the known, widely used and relatively expensive machines. 1

turn of the guide bar, so that these threads It will be understoodthat the invention 1 no r x ting 'b1ade,' imparting a "suction action "to the threads updto the moment of their passage about said sharp bend tocausegthe individual threads to stand out from the face of the webv and'releasing said threads 15 from the influence of said suction action at suchjmoment as Will cause them to spring over the cutting 'bladeunder their tendency f toresume their normal position.

r In testimony whereofI afiixmy signature.

' SJBOYDL 

